Thumb Keyboard Vanished on Onscreen Keyboard

On my SP 2 512 4300 my Thumb Keyboard option has vanished as a choice in my onscreen keyboard and also the size of the keyboard has shrunk to only about 2/3rds of the bottom of the screen and nothing I do seems to be able to correct either problem --Ie trying to grab a corner to enlarge it etc. I can drag it around the screen but can't enlarge it---

Uninstall the driver and reboot and allow plug and play to reinstall and see if it fixes it. Another option is from an elevated CMD Prompt run sfc.exe /scannow and see if it fixes any core system files that have been corrupted.

Uninstall the driver and reboot and allow plug and play to reinstall and see if it fixes it. Another option is from an elevated CMD Prompt run sfc.exe /scannow and see if it fixes any core system files that have been corrupted.